The calculated distance (air line) between Reguengos de Monsaraz and Portimão is approximately 104 miles respectively 168 kilometers.
By car or train, the actual journey to Portimão is certainly longer, as only the direct route (as the crow flies) between Reguengos de Monsaraz and Portimão has been calculated here.
Air line (approximately)
168 kilometers
91 nautical miles